Let us now fix
\(N_{}=2\)  and let
us consider
the triplet \(\lbrace {\cal R}_{j}\rbrace \)  of
the inner-product spaces (REF ) as in [1]}. Then, the
mathematical extreme of Eq. (REF ) might optionally be
marked by a subscripted
bracketed \(j=N_{}\) ,
\({\cal T}_{[N_{}]}: |\psi \rangle \ \rightarrow \ \langle \psi |\ \equiv \ \langle _{[N_{}]} \psi |\,.\) 
